<template>
  <div>
    <span v-for="(item,index) in arr" :key="index">
      <input type="checkbox" v-model="fen" :value="item">{{item}}
    </span>
    <p>大聪明选中的元素，累加的值是{{res}}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      fen:[]
    }
  },
  computed: {
    res(){
      return  this.fen.reduce((sum,item) => sum + item,0)
    }
  }
}
</script>

<style>

</style>